hschlueter 140be836dd Use background thread for FrameEditor's OpenGL calls.
If an OpenGL call blocks because the encoder's input surface is full,
this will now block the background thread while the main thread can
continue querying encoder output and free up encoder capacity until
it accepts more input unblocking the background thread.

PiperOrigin-RevId: 433283287
2022-03-09 15:12:28 +00:00
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